networking/udhcp/dumpleases.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
   4  */
   5 #include <getopt.h>
   6
   7 #include "common.h"
   8 #include "dhcpd.h"
   9
  10
  11 #define REMAINING 0
  12 #define ABSOLUTE 1
  13
  14 int dumpleases_main(int argc, char *argv[])
  15 {
  16         FILE *fp;
  17         int i, c, mode = REMAINING;
  18         long expires;
  19         const char *file = LEASES_FILE;
  20         struct dhcpOfferedAddr lease;
  21         struct in_addr addr;
  22
  23         static const struct option options[] = {
  24                 {"absolute", 0, 0, 'a'},
  25                 {"remaining", 0, 0, 'r'},
  26                 {"file", 1, 0, 'f'},
  27                 {0, 0, 0, 0}
  28         };
  29
  30         while (1) {
  31                 int option_index = 0;
  32                 c = getopt_long(argc, argv, "arf:", options, &option_index);
  33                 if (c == -1) break;
  34
  35                 switch (c) {
  36                 case 'a': mode = ABSOLUTE; break;
  37                 case 'r': mode = REMAINING; break;
  38                 case 'f':
  39                         file = optarg;
  40                         break;
  41                 default:
  42                         bb_show_usage();
  43                 }
  44         }
  45
  46         fp = xfopen(file, "r");
  47
  48         printf("Mac Address       IP-Address      Expires %s\n", mode == REMAINING ? "in" : "at");
  49         /*     "00:00:00:00:00:00 255.255.255.255 Wed Jun 30 21:49:08 1993" */
  50         while (fread(&lease, sizeof(lease), 1, fp)) {
  51                 printf(":%02x"+1, lease.chaddr[0]);
  52                 for (i = 1; i < 6; i++) {
  53                         printf(":%02x", lease.chaddr[i]);
  54                 }
  55                 addr.s_addr = lease.yiaddr;
  56                 printf(" %-15s ", inet_ntoa(addr));
  57                 expires = ntohl(lease.expires);
  58                 if (mode == REMAINING) {
  59                         if (!expires)
  60                                 printf("expired\n");
  61                         else {
  62                                 if (expires > 60*60*24) {
  63                                         printf("%ld days, ", expires / (60*60*24));
  64                                         expires %= 60*60*24;
  65                                 }
  66                                 if (expires > 60*60) {
  67                                         printf("%ld hours, ", expires / (60*60));
  68                                         expires %= 60*60;
  69                                 }
  70                                 if (expires > 60) {
  71                                         printf("%ld minutes, ", expires / 60);
  72                                         expires %= 60;
  73                                 }
  74                                 printf("%ld seconds\n", expires);
  75                         }
  76                 } else printf("%s", ctime(&expires));
  77         }
  78         fclose(fp);
  79
  80         return 0;
  81 }